Ultra-Light Blowback Housing is precision CNC machined from aluminum for enhancing durability and quality. Weighing in at just 17 grams, this blowback housing will improve the cycling action as well as gas transmission and provides smooth and fast blowback action, with better gas efficiency while using this blowback housing. The silver plate is designed for protecting the piston to avoid malfunction. It is compatible with Tokyo Marui M&P9L.